MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Kinematics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In design of arms of a pulley, in belt drive, the cross-section of the arm is elliptical with minor axis placed along the plane of rotation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
In short open-belt drives, an idler pulley is used in order to decrease the angle of contact on the smaller pulley for higher power transmission. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
If the angle of wrap on smaller pulley of diameter 250 mm is 1200 and diameter of larger pulley is twice the diameter of smaller pulley, then the centre distance between the pulleys for an open belt drive is |
| A. | 1000 mm |
| B. | 750 mm |
| C. | 500 mm |
| D. | 250 mm |
| Answer» E. | |
| 4. |
IN_SHORT_OPEN-BELT_DRIVES,_AN_IDLER_PULLEY_IS_USED_IN_ORDER_TO_DECREASE_THE_ANGLE_OF_CONTACT_ON_THE_SMALLER_PULLEY_FOR_HIGHER_POWER_TRANSMISSION.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
In_design_of_arms_of_a_pulley,_in_belt_drive,_the_cross-section_of_the_arm_is_elliptical_with_minor_axis_placed_along_the_plane_of_rotation.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
If the angle of wrap on smaller pulley of diameter 250 mm is 1200 and diameter of larger pulley is twice the diameter of smaller pulley, then the centre distance between the pulleys for an open belt drive i? |
| A. | 1000 mm |
| B. | 750 mm |
| C. | 500 mm |
| D. | 250 mm |
| Answer» E. | |
| 7. |
If the velocity ratio for an open belt drive is 8 and the speed of driving pulley is 800 r.p.m, then considering an elastic creep of 2% the speed of the driven pulley is |
| A. | 104.04 r.p.m |
| B. | 102.04 r.p.m |
| C. | 100.04 r.p.m |
| D. | 98.04 r.p.m |
| Answer» E. | |
| 8. |
In a weston differential pulley block, the number of recesses in the smaller wheel is 9/10 of that of the larger wheel. If the efficiency of the machine is 50%, find the load lifted by an effort of 300N. |
| A. | 2000N |
| B. | 3000N |
| C. | 4000N |
| D. | none of the mentioned |
| Answer» C. 4000N | |
| 9. |
Five pulleys are arranged in the second system of pulleys. When not loadwd the effort required to raise the movable block is 35N. Further wastage in friction increases the pull at the rate of 3% of the load lifted. What is the efficiency of the system at 2kN? |
| A. | 80% |
| B. | 80.81% |
| C. | 80.50% |
| D. | none of the mentioned |
| Answer» C. 80.50% | |
| 10. |
Five pulleys are arranged in the second system of pulleys. When not loaded the effort required to raise the movable block is 35N. Further wastage in friction increases the pull at the rate of 3% of the load lifted. What is the effort required to raise a load of 2kN? |
| A. | 500 N |
| B. | 400 N |
| C. | 495 N |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 11. |
A person weighing 600 N platform attached to the lower block of a system of 5 pulleys arranged in the second system. The platform and the lower block weigh 100N. The man himself supports by exerting a downward pull at the free end of the rope. Neglecting friction, the minimum pull of the man will be |
| A. | 1000 N |
| B. | 200 N |
| C. | 116.7 N |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
Four movable pulleys are arranged as in the first system. If the weight of each pulley is 5 N, calculate the effort which can lift a load of 10 kN. |
| A. | 629.7 N |
| B. | 615 N |
| C. | 625 N |
| D. | none of the mentioned |
| Answer» B. 615 N | |
| 13. |
In a wheel and differential axle, the diameter of the effort wheel is 400 mm. The radii of the load axles are 150mm and 100 mm respectively. The diameter of the rope is 10 mm. Find the load which can be lifted by an effort of 100 N, assuming an efficiency of the machine to be 75%. |
| A. | 800 N |
| B. | 725 N |
| C. | 615 N |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |